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Internal test circuits for color palette device

  • US 5,400,057 A
  • Filed: 09/03/1993
  • Issued: 03/21/1995
  • Est. Priority Date: 06/27/1990
  • Status: Expired due to Term
First Claim
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1. A palette device controllable by a digital computer to produce signals representing color for a color display device, said palette device comprising:

  • a digital video input for receiving a stream of digital video signals representing a color display;

    a look-up table memory connected to said digital video input and employing each digital video signal as an address for recall of a color code consisting of a plurality of bits stored therein;

    a digital to analog conversion circuit connected between said look-up table memory and an output of the palette device for connection to the color display device, said digital to analog conversion circuit converting said color codes recalled from said look-up table memory into analog video signals; and

    accumulator circuitry connected to the look-up table memory to receive said color codes recalled from said look-up table memory, said accumulator detecting the number of bits within the plurality of bits of each color code recalled from said look-up table memory having a particular state and accumulating said detected number of bits for each color code over a period of time between vertical synchronization pulses to thereby generate an externally accessible count of the number of bits having a particular state that are supplied at a given set of outputs of the memory over a period of time between vertical synchronization pulses.

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